/* ==========================================
   リセット・ベーススタイル
   ========================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラースキーム - 業務効率化とテクノロジーを表現 */
    --color-primary: #0066cc;        /* メインブルー - 信頼性と専門性 */
    --color-secondary: #004a99;      /* ダークブルー - 深みと安定感 */
    --color-accent: #557cd1;         /* ターコイズ - 革新性と自動化 */
    --color-accent-alt: #0099ff;     /* ライトブルー - 明るさと効率性 */
    --color-text: #1a2332;           /* ダークネイビー - 視認性の高いテキスト */
    --color-text-light: #5a6c7d;     /* ミディアムグレーブルー - サブテキスト */
    --color-bg: #ffffff;             /* 白背景 */
    --color-bg-dark: #001a33;        /* ダークネイビー背景 */
    --color-bg-light: #f0f7ff;       /* ライトブルー背景 */
    --color-border: #d1e3f5;         /* ソフトブルーボーダー */
    --color-success: #1e00c8;        /* グリーン - 成功・効率化 */
    --color-gradient-start: #0066cc; /* グラデーション開始 */
    --color-gradient-end: #00a3cc;   /* グラデーション終了 */

    /* フォントサイズ - より適切なサイズに調整 */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.375rem;
    --font-size-2xl: 1.75rem;
    --font-size-3xl: 2.25rem;
    --font-size-4xl: 3rem;
    --font-size-5xl: 3.75rem;
    --font-size-6xl: 4.5rem;
    --font-size-7xl: 4.5rem;

    /* スペーシング - 参考サイトに合わせてより大胆に */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2.5rem;
    --spacing-lg: 5rem;
    --spacing-xl: 8rem;
    --spacing-2xl: 10rem;
    --spacing-3xl: 12rem;

    /* トランジション */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Arial, "Yu Gothic", "Meiryo", sans-serif;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
    font-weight: 400;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-base);
}

ul {
    list-style: none;
}

/* ==========================================
   コンテナ
   ========================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ==========================================
   セクション共通スタイル
   ========================================== */

section {
    padding: var(--spacing-3xl) 0;
}

.section__title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.section__subtitle {
    font-size: var(--font-size-lg);
    text-align: center;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

/* ==========================================
   ヘッダー・ナビゲーション
   ========================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: var(--transition-base);
}

.nav__container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav__logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-primary);
}

.nav__menu {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav__link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: 0.05em;
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: var(--transition-base);
}

.nav__link:hover {
    color: var(--color-text-light);
}

.nav__link--cta {
    background-color: var(--color-accent);
    color: #ffffff;
    border-radius: 0;
    padding: 0.75rem 1.5rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    transition: all 0.3s ease;
}

.nav__link--cta:hover {
    background-color: var(--color-primary);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 102, 204, 0.3);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav__toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition-base);
}

/* ==========================================
   ヒーローセクション
   ========================================== */

.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    overflow: hidden;
}

.hero__slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.hero__slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease;
}

.hero__slide--active {
    opacity: 1;
}

.hero__background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        linear-gradient(135deg, rgba(0, 102, 204, 0.85) 0%, rgba(0, 74, 153, 0.85) 100%),
        url('https://images.unsplash.com/photo-1454165804606-c3d57bc86b40?w=1920&q=80');
    background-size: cover;
    background-position: center;
}

.hero__content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: #ffffff;
    padding: var(--spacing-md);
}

.hero__title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    letter-spacing: -0.01em;
    margin-bottom: var(--spacing-md);
    margin-top: 20vh;
    line-height: 1.3;
    animation: fadeInUp 1s ease 0.3s both;
}

.hero__subtitle {
    font-size: var(--font-size-xl);
    font-weight: 400;
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.9);
    animation: fadeInUp 1s ease 0.5s both;
    letter-spacing: 0.02em;
}

.hero__scroll {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: #ffffff;
    font-size: var(--font-size-xs);
    letter-spacing: 0.2em;
    animation: fadeIn 1s ease 1s both;
}

.hero__scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, #ffffff, transparent);
    animation: scrollLine 2s ease-in-out infinite;
}

/* ==========================================
   ボタン
   ========================================== */

.btn {
    display: inline-block;
    padding: 1.25rem 3rem;
    font-size: var(--font-size-base);
    font-weight: 700;
    text-align: center;
    border-radius: 0;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    transition: left 0.3s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn--primary {
    background-color: #ffffff;
    color: var(--color-primary);
    border-color: #ffffff;
}

.btn--primary:hover {
    background-color: var(--color-accent);
    color: #ffffff;
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 212, 170, 0.3);
}

.btn--secondary {
    background-color: transparent;
    color: #ffffff;
    border-color: #ffffff;
}

.btn--secondary:hover {
    background-color: #ffffff;
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.2);
}

.btn--large {
    padding: 1.5rem 4rem;
    font-size: var(--font-size-lg);
}

/* ==========================================
   課題セクション
   ========================================== */

.challenges {
    background-color: var(--color-bg);
    position: relative;
}

.challenges::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 10% 20%, rgba(0, 102, 204, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 212, 170, 0.03) 0%, transparent 40%);
    pointer-events: none;
}

.challenges .container {
    position: relative;
    z-index: 1;
}

.challenges__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.challenge-card {
    background: linear-gradient(135deg, #ffffff 0%, var(--color-bg-light) 100%);
    padding: 3rem 2.5rem;
    border-radius: 16px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(0, 102, 204, 0.08);
    position: relative;
    overflow: hidden;
    box-shadow:
        0 4px 16px rgba(0, 102, 204, 0.06),
        0 2px 8px rgba(0, 0, 0, 0.04);
    min-height: 280px;
    display: flex;
    flex-direction: column;
}

.challenge-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.challenge-card:hover::before {
    transform: scaleX(1);
}

.challenge-card:hover {
    transform: translateY(-8px);
    box-shadow:
        0 20px 40px rgba(0, 102, 204, 0.12),
        0 8px 16px rgba(0, 0, 0, 0.08);
    border-color: rgba(0, 102, 204, 0.15);
}

.challenge-card__number {
    font-size: 4rem;
    font-weight: 900;
    color: var(--color-primary);
    margin-bottom: 0;
    opacity: 0.18;
    line-height: 1;
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    z-index: 0;
    font-family: 'Arial Black', sans-serif;
    transition: all 0.4s ease;
}

.challenge-card:hover .challenge-card__number {
    opacity: 0.25;
    transform: scale(1.05);
}

.challenge-card__title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    margin-top: 4.25rem;
    color: var(--color-text);
    line-height: 1.5;
    letter-spacing: -0.02em;
    position: relative;
    z-index: 1;
    padding-right: 1rem;
}

.challenge-card__text {
    color: var(--color-text-light);
    line-height: 2;
    font-size: 1rem;
    position: relative;
    z-index: 1;
    margin-bottom: 0;
}

/* ==========================================
   価値セクション
   ========================================== */

.value {
    background:
        linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-gradient-end) 100%),
        radial-gradient(circle at 80% 80%, rgba(0, 212, 170, 0.15) 0%, transparent 50%);
    color: #ffffff;
    position: relative;
    overflow: hidden;
}

.value::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 25% 25%, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        radial-gradient(circle at 75% 75%, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    background-position: 0 0, 25px 25px;
    pointer-events: none;
}

.value .container {
    position: relative;
    z-index: 1;
}

.value .section__title {
    color: #ffffff;
}

.value .section__subtitle {
    color: rgba(255, 255, 255, 0.75);
    font-size: var(--font-size-xl);
}

/* ==========================================
   サービスセクション
   ========================================== */

.services {
    background:
        linear-gradient(to bottom, var(--color-bg) 0%, var(--color-bg-light) 50%, var(--color-bg) 100%);
    position: relative;
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(0, 212, 170, 0.02) 0%, transparent 30%),
        radial-gradient(circle at 80% 70%, rgba(0, 153, 255, 0.02) 0%, transparent 30%);
    pointer-events: none;
}

.services .container {
    position: relative;
    z-index: 1;
}

.service {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    align-items: center;
}

.service--reverse {
    direction: rtl;
}

.service--reverse .service__content {
    direction: ltr;
}

.service--reverse .service__image {
    direction: ltr;
}

.service__label {
    font-size: var(--font-size-xs);
    font-weight: 700;
    letter-spacing: 0.3em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    position: relative;
    padding-left: var(--spacing-md);
}

.service__label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    background-color: var(--color-primary);
}

.service__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
    letter-spacing: -0.01em;
}

.service__description {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-light);
}

.service__subtitle {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.service__list {
    list-style: none;
    padding-left: 0;
}

.service__list li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    line-height: 1.8;
}

.service__list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.service__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.service__tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-bg-light);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.service__image {
    position: relative;
    width: 100%;
    height: 600px;
    border-radius: 0;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.service__image-placeholder {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: var(--font-size-5xl);
    font-weight: 900;
    position: relative;
    overflow: hidden;
}

.service__image-placeholder[data-text="Document Management"] {
    background:
        linear-gradient(135deg, rgba(0, 102, 204, 0.75) 0%, rgba(0, 74, 153, 0.75) 100%),
        url('https://images.unsplash.com/photo-1568992687947-868a62a9f521?w=1200&q=80');
}

.service__image-placeholder[data-text="AI Automation"] {
    background:
        linear-gradient(135deg, rgba(0, 102, 204, 0.75) 0%, rgba(0, 74, 153, 0.75) 100%),
        url('https://images.unsplash.com/photo-1551288049-bebda4e38f71?w=1200&q=80');
}

.service__image-placeholder[data-text="Custom ERP"] {
    background:
        linear-gradient(135deg, rgba(0, 102, 204, 0.75) 0%, rgba(0, 74, 153, 0.75) 100%),
        url('https://images.unsplash.com/photo-1460925895917-afdab827c52f?w=1200&q=80');
}

.service__image-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100"><defs><pattern id="dots" x="0" y="0" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="2" cy="2" r="1.5" fill="rgba(255,255,255,0.08)"/></pattern></defs><rect width="100" height="100" fill="url(%23dots)"/></svg>');
    opacity: 1;
}

.service__image-placeholder::after {
    content: attr(data-text);
    opacity: 0.52;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: var(--font-size-6xl);
    font-weight: 900;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

/* ==========================================
   私たちについてセクション
   ========================================== */

.about {
    background:
        linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-light) 100%);
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 15% 15%, rgba(0, 102, 204, 0.04) 0%, transparent 25%),
        radial-gradient(circle at 85% 85%, rgba(0, 212, 170, 0.04) 0%, transparent 25%);
    pointer-events: none;
}

.about .container {
    position: relative;
    z-index: 1;
}

.about__content {
    max-width: 900px;
    margin: 0 auto;
}

.about__subtitle {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-xl);
    letter-spacing: -0.01em;
    position: relative;
    padding-left: var(--spacing-md);
}

.about__subtitle::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-primary);
}

.about__text {
    font-size: var(--font-size-lg);
    line-height: 1.9;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
}

.about__list {
    list-style: none;
    margin: var(--spacing-md) 0;
}

.about__list li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

.about__list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.approach__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.approach-card {
    background-color: var(--color-bg-light);
    padding: var(--spacing-lg);
    border-radius: 0;
    border: none;
    border-top: 3px solid var(--color-accent);
}

.approach-card__number {
    font-size: var(--font-size-3xl);
    font-weight: 900;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    opacity: 0.15;
    line-height: 1;
}

.approach-card__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.approach-card__list {
    list-style: none;
}

.approach-card__list li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    line-height: 1.8;
    font-size: var(--font-size-sm);
}

.approach-card__list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.strengths__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.strength-card {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: #ffffff;
    padding: var(--spacing-lg) var(--spacing-md);
    border-radius: 0;
    text-align: center;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.strength-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-accent);
}

.strength-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.strength-card__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.05em;
    line-height: 1.3;
}

.strength-card__text {
    font-size: var(--font-size-base);
    line-height: 1.8;
    opacity: 0.95;
    letter-spacing: 0.02em;
    max-width: 100%;
}

/* ==========================================
   会社概要セクション
   ========================================== */

.company {
    background-color: var(--color-bg);
    position: relative;
}

.company::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 50% 50%, rgba(0, 102, 204, 0.02) 0%, transparent 50%);
    pointer-events: none;
}

.company .container {
    position: relative;
    z-index: 1;
}

.company__table {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    border-collapse: collapse;
}

.company__table th,
.company__table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.company__table th {
    font-weight: 600;
    width: 200px;
    background-color: var(--color-bg-light);
}

.company__table td {
    line-height: 1.8;
}

/* ==========================================
   お問い合わせセクション
   ========================================== */

.contact {
    background:
        linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-gradient-end) 100%),
        radial-gradient(circle at 50% 120%, rgba(0, 212, 170, 0.2) 0%, transparent 50%);
    color: #ffffff;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.06) 1px, transparent 1px),
        radial-gradient(circle at 70% 70%, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
    background-size: 40px 40px;
    background-position: 0 0, 20px 20px;
    pointer-events: none;
}

.contact .container {
    position: relative;
    z-index: 1;
}

.contact .section__title {
    color: #ffffff;
}

.contact .section__subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.contact__buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.contact__form-container {
    max-width: 800px;
    margin: 2.5rem auto 0;
    padding: 0 1.25rem;
}

.contact__form-container iframe {
    width: 100%;
    max-width: 640px;
    height: 1048px;
    border: none;
    border-radius: 8px;
    background: #ffffff;
    display: block;
    margin: 0 auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

@media (max-width: 768px) {
    .contact__form-container {
        padding: 0 0.5rem;
    }

    .contact__form-container iframe {
        height: 900px;
    }
}

/* ==========================================
   フッター
   ========================================== */

.footer {
    background-color: var(--color-bg-dark);
    color: #ffffff;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: 0.1em;
}

.footer__nav {
    display: flex;
    gap: var(--spacing-md);
}

.footer__link {
    font-size: var(--font-size-sm);
    opacity: 0.8;
    transition: var(--transition-base);
}

.footer__link:hover {
    opacity: 1;
}

.footer__bottom {
    text-align: center;
}

.footer__copyright {
    font-size: var(--font-size-xs);
    opacity: 0.6;
}

/* ==========================================
   アニメーション
   ========================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scrollLine {
    0%, 100% {
        transform: scaleY(1);
        transform-origin: top;
    }
    50% {
        transform: scaleY(1.5);
        transform-origin: top;
    }
}

/* スクロールアニメーション用のクラス */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================
   レスポンシブデザイン
   ========================================== */

@media (max-width: 1024px) {
    .hero__title {
        font-size: var(--font-size-6xl);
    }

    .section__title {
        font-size: var(--font-size-4xl);
    }

    .service {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .service--reverse {
        direction: ltr;
    }

    .service__image {
        height: 500px;
    }

    .service__title {
        font-size: var(--font-size-3xl);
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 5rem;
        --spacing-2xl: 6rem;
        --spacing-3xl: 8rem;
    }

    section {
        padding: var(--spacing-2xl) 0;
    }

    .nav__menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--color-bg);
        flex-direction: column;
        padding: var(--spacing-lg);
        transition: var(--transition-base);
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    }

    .nav__menu.active {
        left: 0;
    }

    .nav__toggle {
        display: flex;
    }

    .hero__title {
        font-size: var(--font-size-5xl);
        line-height: 1.1;
    }

    .hero__subtitle {
        font-size: var(--font-size-xl);
    }

    .section__title {
        font-size: var(--font-size-3xl);
    }

    .challenges__grid {
        grid-template-columns: 1fr;
    }

    .service__title {
        font-size: var(--font-size-3xl);
    }

    .service__image {
        height: 350px;
    }

    .approach__grid {
        grid-template-columns: 1fr;
    }

    .strengths__grid {
        grid-template-columns: 1fr;
    }

    .strength-card__title {
        font-size: var(--font-size-xl);
    }

    .strength-card__text {
        font-size: var(--font-size-sm);
    }

    .footer__content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .footer__nav {
        flex-direction: column;
        align-items: center;
    }

    .company__table th,
    .company__table td {
        display: block;
        width: 100%;
    }

    .company__table th {
        padding-bottom: var(--spacing-xs);
    }

    .company__table td {
        padding-top: var(--spacing-xs);
    }

    .contact__buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn--large {
        width: 100%;
        max-width: 350px;
    }
}

@media (max-width: 480px) {
    .hero__title {
        font-size: var(--font-size-4xl);
        text-transform: none;
    }

    .section__title {
        font-size: var(--font-size-2xl);
    }

    .service__title {
        font-size: var(--font-size-2xl);
    }

    .about__subtitle {
        font-size: var(--font-size-2xl);
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .service__image {
        height: 300px;
    }
}